This is the 10056th most frequent Polish word.
betonowej
"Betonowej" means "concrete" (adjective, relating to concrete).
In this example, 'betonowej' is functioning as an adjective in the genitive case to describe 'masy', referring to the substance being concrete.
Chodnik jest wykonany z betonowej masy.
The sidewalk is made of concrete mixture.
'Betonowej' in this case is an adjective in the genitive case modifying 'rurki', indicating the material composition of the pipe.
Studnia w ogrodzie została zbudowana z betonowej rurki.
The well in the garden was built from a concrete pipe.
Here, 'betonowej' is used as an adjective in the genitive case modifying 'konstrukcji', denoting that the construction is made of concrete.